src/plugins/vmxnet3/input.c

   1 /*
   2  *------------------------------------------------------------------
   3  * Copyright (c) 2018 Cisco and/or its affiliates.
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *------------------------------------------------------------------
  16  */
  17
  18 #include <vlib/vlib.h>
  19 #include <vlib/unix/unix.h>
  20 #include <vlib/pci/pci.h>
  21 #include <vnet/ethernet/ethernet.h>
  22 #include <vnet/devices/devices.h>
  23 #include <vnet/ip/ip6_packet.h>
  24 #include <vnet/ip/ip4_packet.h>
  25 #include <vnet/udp/udp_packet.h>
  26
  27 #include <vmxnet3/vmxnet3.h>
  28
  29 #define foreach_vmxnet3_input_error \
  30   _(BUFFER_ALLOC, "buffer alloc error") \
  31   _(RX_PACKET_NO_SOP, "Rx packet error - no SOP") \
  32   _(RX_PACKET, "Rx packet error") \
  33   _(RX_PACKET_EOP, "Rx packet error found on EOP") \
  34   _(NO_BUFFER, "Rx no buffer error")
  35
  36 typedef enum
  37 {
  38 #define _(f,s) VMXNET3_INPUT_ERROR_##f,
  39   foreach_vmxnet3_input_error
  40 #undef _
  41     VMXNET3_INPUT_N_ERROR,
  42 } vmxnet3_input_error_t;
  43
  44 static __clib_unused char *vmxnet3_input_error_strings[] = {
  45 #define _(n,s) s,
  46   foreach_vmxnet3_input_error
  47 #undef _
  48 };
  49
  50 static_always_inline u16
  51 vmxnet3_find_rid (vmxnet3_device_t * vd, vmxnet3_rx_comp * rx_comp)
  52 {
  53   u32 rid;
  54
  55   // rid is bits 16-25 (10 bits number)
  56   rid = rx_comp->index & (0xffffffff >> 6);
  57   rid >>= 16;
  58   if ((rid >= vd->num_rx_queues) && (rid < (vd->num_rx_queues << 1)))
  59     return 1;
  60   else
  61     return 0;
  62 }
  63
  64 static_always_inline void
  65 vmxnet3_rx_comp_ring_advance_next (vmxnet3_rxq_t * rxq)
  66 {
  67   vmxnet3_rx_comp_ring *comp_ring = &rxq->rx_comp_ring;
  68
  69   comp_ring->next++;
  70   if (PREDICT_FALSE (comp_ring->next == rxq->size))
  71     {
  72       comp_ring->next = 0;
  73       comp_ring->gen ^= VMXNET3_RXCF_GEN;
  74     }
  75 }
  76
  77 static_always_inline void
  78 vmxnet3_handle_offload (vmxnet3_rx_comp * rx_comp, vlib_buffer_t * hb,
  79                         u16 * next, u16 gso_size)
  80 {
  81   u8 l4_hdr_sz = 0;
  82
  83   if (rx_comp->flags & VMXNET3_RXCF_IP4)
  84     {
  85       ip4_header_t *ip4 = (ip4_header_t *) (hb->data +
  86                                             sizeof (ethernet_header_t));
  87
  88       vnet_buffer (hb)->l2_hdr_offset = 0;
  89       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
  90       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
  91         ip4_header_bytes (ip4);
  92       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
  93         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
  94         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP4;
  95       next[0] = VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
  96
  97       /* checksum offload */
  98       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
  99         {
 100           if (!(rx_comp->flags & VMXNET3_RXCF_IPC))
 101             {
 102               hb->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
 103               ip4->checksum = 0;
 104             }
 105           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 106             {
 107               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 108                 {
 109                   tcp_header_t *tcp =
 110                     (tcp_header_t *) (hb->data +
 111                                       vnet_buffer (hb)->l4_hdr_offset);
 112                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 113                   tcp->checksum = 0;
 114                 }
 115               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 116                 {
 117                   udp_header_t *udp =
 118                     (udp_header_t *) (hb->data +
 119                                       vnet_buffer (hb)->l4_hdr_offset);
 120                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 121                   udp->checksum = 0;
 122                 }
 123             }
 124         }
 125
 126       if (gso_size)
 127         {
 128           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 129             {
 130               tcp_header_t *tcp =
 131                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 132               l4_hdr_sz = tcp_header_bytes (tcp);
 133             }
 134           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 135             {
 136               udp_header_t *udp =
 137                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 138               l4_hdr_sz = sizeof (*udp);
 139             }
 140           vnet_buffer2 (hb)->gso_size = gso_size;
 141           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 142           hb->flags |= VNET_BUFFER_F_GSO;
 143         }
 144       vlib_buffer_advance (hb, device_input_next_node_advance[next[0]]);
 145     }
 146   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 147     {
 148       vnet_buffer (hb)->l2_hdr_offset = 0;
 149       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 150       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 151         sizeof (ip6_header_t);
 152       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 153         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 154         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP6;
 155       next[0] = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
 156
 157       /* checksum offload */
 158       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 159         {
 160           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 161             {
 162               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 163                 {
 164                   tcp_header_t *tcp =
 165                     (tcp_header_t *) (hb->data +
 166                                       vnet_buffer (hb)->l4_hdr_offset);
 167                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 168                   tcp->checksum = 0;
 169                 }
 170               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 171                 {
 172                   udp_header_t *udp =
 173                     (udp_header_t *) (hb->data +
 174                                       vnet_buffer (hb)->l4_hdr_offset);
 175                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 176                   udp->checksum = 0;
 177                 }
 178             }
 179         }
 180
 181       if (gso_size)
 182         {
 183           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 184             {
 185               tcp_header_t *tcp =
 186                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 187               l4_hdr_sz = tcp_header_bytes (tcp);
 188             }
 189           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 190             {
 191               udp_header_t *udp =
 192                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 193               l4_hdr_sz = sizeof (*udp);
 194             }
 195           vnet_buffer2 (hb)->gso_size = gso_size;
 196           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 197           hb->flags |= VNET_BUFFER_F_GSO;
 198         }
 199       vlib_buffer_advance (hb, device_input_next_node_advance[next[0]]);
 200     }
 201   else
 202     next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 203 }
 204
 205 static_always_inline uword
 206 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 207                              vlib_frame_t * frame, vmxnet3_device_t * vd,
 208                              u16 qid)
 209 {
 210   vnet_main_t *vnm = vnet_get_main ();
 211   uword n_trace = vlib_get_trace_count (vm, node);
 212   u32 n_rx_packets = 0, n_rx_bytes = 0;
 213   vmxnet3_rx_comp *rx_comp;
 214   u32 desc_idx;
 215   vmxnet3_rxq_t *rxq;
 216   u32 thread_index = vm->thread_index;
 217   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
 218   u16 nexts[VLIB_FRAME_SIZE], *next;
 219   vmxnet3_rx_ring *ring;
 220   vmxnet3_rx_comp_ring *comp_ring;
 221   u16 rid;
 222   vlib_buffer_t *prev_b0 = 0, *hb = 0;
 223   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 224   u8 known_next = 0, got_packet = 0;
 225   vmxnet3_rx_desc *rxd;
 226   clib_error_t *error;
 227   u16 gso_size = 0;
 228
 229   rxq = vec_elt_at_index (vd->rxqs, qid);
 230   comp_ring = &rxq->rx_comp_ring;
 231   bi = buffer_indices;
 232   next = nexts;
 233   rx_comp = &rxq->rx_comp[comp_ring->next];
 234
 235   while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
 236                        (comp_ring->gen ==
 237                         (rx_comp->flags & VMXNET3_RXCF_GEN))))
 238     {
 239       vlib_buffer_t *b0;
 240       u32 bi0;
 241
 242       rid = vmxnet3_find_rid (vd, rx_comp);
 243       ring = &rxq->rx_ring[rid];
 244
 245       if (PREDICT_TRUE (ring->fill >= 1))
 246         ring->fill--;
 247       else
 248         {
 249           vlib_error_count (vm, node->node_index,
 250                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 251           if (hb)
 252             {
 253               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 254               hb = 0;
 255             }
 256           prev_b0 = 0;
 257           break;
 258         }
 259
 260       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 261       ring->consume = desc_idx;
 262       rxd = &rxq->rx_desc[rid][desc_idx];
 263
 264       bi0 = ring->bufs[desc_idx];
 265       ring->bufs[desc_idx] = ~0;
 266
 267       b0 = vlib_get_buffer (vm, bi0);
 268       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 269       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 270       vnet_buffer (b0)->feature_arc_index = 0;
 271       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 272       b0->current_data = 0;
 273       b0->total_length_not_including_first_buffer = 0;
 274       b0->next_buffer = 0;
 275       b0->flags = 0;
 276       b0->error = 0;
 277       b0->current_config_index = 0;
 278       ASSERT (b0->current_length != 0);
 279
 280       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 281                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 282         {
 283           vlib_buffer_free_one (vm, bi0);
 284           vlib_error_count (vm, node->node_index,
 285                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 286           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 287             {
 288               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 289               hb = 0;
 290             }
 291           prev_b0 = 0;
 292           goto next;
 293         }
 294
 295       if (rx_comp->index & VMXNET3_RXCI_SOP)
 296         {
 297           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 298           /* start segment */
 299           if ((vd->lro_enable) &&
 300               (rx_comp->flags & VMXNET3_RXCF_CT) == VMXNET3_RXCOMP_TYPE_LRO)
 301             {
 302               vmxnet3_rx_comp_ext *lro = (vmxnet3_rx_comp_ext *) rx_comp;
 303
 304               gso_size = lro->flags & VMXNET3_RXECF_MSS_MASK;
 305             }
 306
 307           hb = b0;
 308           bi[0] = bi0;
 309           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 310             {
 311               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 312               prev_b0 = b0;
 313             }
 314           else
 315             {
 316               /*
 317                * Both start and end of packet is set. It is a complete packet
 318                */
 319               prev_b0 = 0;
 320               got_packet = 1;
 321             }
 322         }
 323       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 324         {
 325           /* end of segment */
 326           if (prev_b0)
 327             {
 328               prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 329               prev_b0->next_buffer = bi0;
 330               hb->total_length_not_including_first_buffer +=
 331                 b0->current_length;
 332               prev_b0 = 0;
 333               got_packet = 1;
 334             }
 335           else
 336             {
 337               /* EOP without SOP, error */
 338               vlib_error_count (vm, node->node_index,
 339                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 340               vlib_buffer_free_one (vm, bi0);
 341               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 342                 {
 343                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 344                   hb = 0;
 345                 }
 346               goto next;
 347             }
 348         }
 349       else if (prev_b0)         // !sop && !eop
 350         {
 351           /* mid chain */
 352           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 353           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 354           prev_b0->next_buffer = bi0;
 355           prev_b0 = b0;
 356           hb->total_length_not_including_first_buffer += b0->current_length;
 357         }
 358       else
 359         {
 360           vlib_error_count (vm, node->node_index,
 361                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 362           vlib_buffer_free_one (vm, bi0);
 363           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 364             {
 365               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 366               hb = 0;
 367             }
 368           goto next;
 369         }
 370
 371       n_rx_bytes += b0->current_length;
 372
 373       if (got_packet)
 374         {
 375           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 376             {
 377               next_index = vd->per_interface_next_index;
 378               known_next = 1;
 379             }
 380
 381           if (PREDICT_FALSE
 382               (vnet_device_input_have_features (vd->sw_if_index)))
 383             {
 384               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 385                                                   &next_index, hb);
 386               known_next = 1;
 387             }
 388
 389           if (PREDICT_FALSE (known_next))
 390             {
 391               next[0] = next_index;
 392             }
 393           else
 394             {
 395               ethernet_header_t *e = (ethernet_header_t *) hb->data;
 396
 397               if (ethernet_frame_is_tagged (e->type))
 398                 next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 399               else
 400                 vmxnet3_handle_offload (rx_comp, hb, next, gso_size);
 401             }
 402
 403           n_rx_packets++;
 404           next++;
 405           bi++;
 406           hb = 0;
 407           got_packet = 0;
 408           gso_size = 0;
 409         }
 410
 411     next:
 412       vmxnet3_rx_comp_ring_advance_next (rxq);
 413       rx_comp = &rxq->rx_comp[comp_ring->next];
 414     }
 415
 416   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 417     {
 418       u32 n_left = n_rx_packets;
 419
 420       bi = buffer_indices;
 421       next = nexts;
 422       while (n_trace && n_left)
 423         {
 424           vlib_buffer_t *b;
 425           vmxnet3_input_trace_t *tr;
 426
 427           b = vlib_get_buffer (vm, bi[0]);
 428           vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
 429           tr = vlib_add_trace (vm, node, b, sizeof (*tr));
 430           tr->next_index = next[0];
 431           tr->hw_if_index = vd->hw_if_index;
 432           tr->buffer = *b;
 433
 434           n_trace--;
 435           n_left--;
 436           bi++;
 437           next++;
 438         }
 439       vlib_set_trace_count (vm, node, n_trace);
 440     }
 441
 442   if (PREDICT_TRUE (n_rx_packets))
 443     {
 444       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 445                                    n_rx_packets);
 446       vlib_increment_combined_counter
 447         (vnm->interface_main.combined_sw_if_counters +
 448          VNET_INTERFACE_COUNTER_RX, thread_index,
 449          vd->hw_if_index, n_rx_packets, n_rx_bytes);
 450     }
 451
 452   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 453   if (PREDICT_FALSE (error != 0))
 454     {
 455       vlib_error_count (vm, node->node_index,
 456                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 457     }
 458   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 459   if (PREDICT_FALSE (error != 0))
 460     {
 461       vlib_error_count (vm, node->node_index,
 462                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 463     }
 464
 465   return n_rx_packets;
 466 }
 467
 468 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 469                                    vlib_node_runtime_t * node,
 470                                    vlib_frame_t * frame)
 471 {
 472   u32 n_rx = 0;
 473   vmxnet3_main_t *vmxm = &vmxnet3_main;
 474   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
 475   vnet_device_and_queue_t *dq;
 476
 477   foreach_device_and_queue (dq, rt->devices_and_queues)
 478   {
 479     vmxnet3_device_t *vd;
 480     vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
 481     if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 482       continue;
 483     n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
 484   }
 485   return n_rx;
 486 }
 487
 488 #ifndef CLIB_MARCH_VARIANT
 489 /* *INDENT-OFF* */
 490 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 491   .name = "vmxnet3-input",
 492   .sibling_of = "device-input",
 493   .format_trace = format_vmxnet3_input_trace,
 494   .type = VLIB_NODE_TYPE_INPUT,
 495   .state = VLIB_NODE_STATE_DISABLED,
 496   .n_errors = VMXNET3_INPUT_N_ERROR,
 497   .error_strings = vmxnet3_input_error_strings,
 498 };
 499 #endif
 500
 501 /* *INDENT-ON* */
 502
 503 /*
 504  * fd.io coding-style-patch-verification: ON
 505  *
 506  * Local Variables:
 507  * eval: (c-set-style "gnu")
 508  * End:
 509  */